uniform mat4 ProjectionMatrix;
uniform mat4 ModelViewMatrix;
attribute vec4 Vertex;
//attribute vec4 Color;
void main() {
  //gl_Color = vec4 (1.0, 0.0, 0.0, 1.0);
  //gl_BackColor = vec4 (0.0, 0.0, 0.0, 1.0);
  gl_Position = ProjectionMatrix * ModelViewMatrix * Vertex;
}
